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To all whom it may concern:

llle it known that l, 'lnonas G. Mnanows, a citizen of the United States, residing at New York, in the county of New York and t ltate of New York, have invented new and useful improvements in Processes of Producing High-Phosphorus Pig-iron, of which the following a specification.

This invention relates to a new and use ful process of treating greensand or like materials containing iron and an alkali metal, particularly potassium.

The object of this invention is to provide a method which will be simple in its nature, comparatively easy to carry out and less costly to operate than those heretofore proposed. "With these and other objects in view the invention consists in the novel steps and combination of steps constituting the proctill i, s all as Will be more fully hereinafter dis- .osed and particularly pointed out in the claims.

lln carrying out this invention glauconite, commonly called greensand, phosphate rock,

and colic or other suitable fuel, are fed to a blast furnace.

ltn addition to high phosphorus pig iron, other valuable materials are recovered in the operation. These comprise potassiumnitrogen-carbon compounds.

Although 1 preferably employ a blast furnace ll do not Wish to be limited to this other types, such as electric furnaces, etc, may be employed With more or less success provided they are constructed and operated in such a manner that the reactions are substantially those normally occurring in a blast furnace.

lln preparing the materials for charging, briqueting or sintering may be resorted to especiallyin the case of greensand Winch has a tendency to dust and choke up a furnace.

As the material sought in my process is essentially a high phosphorus pig iron the proportions of the various constituents of the charge are determined With this end in view. This necessitates either limiting the phosphate roclr to a point Where all of its liberated phosphorus may be taken into coinbination by the iron of the greensand, or the total iron of the charge may be increased by the addition of iron ore, such as mag netite, etc, and especiallyvarieties contaminated With apatite. Also if the charge is hpeci'fication of Letters Patent.

Application filed May 4-, 191%.

Patented Nor, f8, 1919..

Elerial No. 239L436.

deficient in acid or basic constituents respectively, ll'flfl or Cat) may be added.

Another method of increasing the iron Although l have specified greensand it do not Wish to be limited to this particular material as any potassium iron carrying material Will answer the purpose, or any suitable mixture of materials containing these.

lit has long been recognized that potassiumnitrogen-carbon compounds are formed in the reaction zones of blast furnaces and play an important though little understood part in the general reactions. It has been stated that KCN is the agent that reduces l et) to Fe and thatit is formed by the con tact of potassium vapor and nitrogen in presence of incandescent carbon.

The amount of potassium normally occurring in blast furnace charges is very small occurring only as impurities in the charge. In this invention the amount of potassiumnitrogen-carbon compounds is so considerable that a large part of same may be recovered by removing them from the reaction zone of the blast furnace before they are decomposed, Without interfering With the production of the high phosphorus pig iron.

lit is obvious that those skilled in the art may vary the details of the process as Well as the proportions set forth, Without departing from the spirit of the invention, and therefore it do not Wish to be limited to the above disclosures except as may be required by the claims.

it claim:

1. A process of producing high phos phorus pig iron and nitrogen-potassiumcarbon-compounds which comprises smelting greensand; phosphate rock; and fuel in a blast furnace; substantially as described.

2. A process of producing high phosphorus pig iron and nitrogen-potassiumcarbon-compounds Which comprises smelt ing-greensand; phosphate rock; and coke in a blast furnace; periodically tapping off the molten high phosphorus iron; and continuously drawing off the vapor in the region immediately above the reaction zone of the furnace; substantially as described.

3. A process of producing high phosllld phorus pig iron and nitrogen-potassiumcarbon-compounds Which comprises smelting -greensan'd; phosphate rock; and fuel in a blast furnace; tapping off the molten high phosphorus iron; and drawing'ofi the vapors and suspended solids from the region immediately above the reaction Zone; substantially as described.

4. A process of producing high phosphorus pig iron and nitrogen-potassiumcarbon-compounds Which comprises smelting greensand; phosphate rock; and fuel; tapping off the molten high phosphorus iron and drawing off the potassium-nitrogencarbon compounds from the region immediately above the reaction zone; substantially as described.

5. A process of producing high phosphorus pig iron and nitrogen-potassiumcarbon-compounds which comprises smelting greensand accompanied by additional iron ore; phosphate rock; and fuel; tapping off the molten high phosphorus iron; and drawing off the nitrogen-potassiumcarbon compounds from the region imme- 7 scribed.

8. A process of producing high phosphorus pig iron and nitrogcn-potassimncarbon-compounds which comprises smelting greensand ore; phosphate rock associated With additional fiuxing material; and

fuel; tapping ofl? the molten high phosphorus iron; and drawing off the nitrogenpotassium-carbon compounds from the re gion immediately above the reaction zone; substantially as described.

THOMAS C. MEADOWS. 

